Tool holder



FIG. 1 is a perspective view of a tool holder showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an end elevational view thereof opposite to that shown in FIG. 3; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a tool holder, substantially as shown. 